EP4318094A1 - Élément de lentille - Google Patents

Élément de lentille Download PDF

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Publication number
EP4318094A1
EP4318094A1 EP22315180.4A EP22315180A EP4318094A1 EP 4318094 A1 EP4318094 A1 EP 4318094A1 EP 22315180 A EP22315180 A EP 22315180A EP 4318094 A1 EP4318094 A1 EP 4318094A1
Authority
EP
European Patent Office
Prior art keywords
zone
lens element
microstructured
element according
optical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22315180.4A
Other languages
German (de)
English (en)
Inventor
Patrick HUGONNEAUX
Matthieu Guillot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EssilorLuxottica SA
Essilor International SAS
Original Assignee
Essilor International Compagnie Generale dOptique SA
Essilor International SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Essilor International Compagnie Generale dOptique SA, Essilor International SAS filed Critical Essilor International Compagnie Generale dOptique SA
Priority to EP22315180.4A priority Critical patent/EP4318094A1/fr
Priority to PCT/EP2023/071442 priority patent/WO2024028401A1/fr
Publication of EP4318094A1 publication Critical patent/EP4318094A1/fr
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/022—Ophthalmic lenses having special refractive features achieved by special materials or material structures
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
    • G02C2202/24—Myopia progression prevention

Definitions

  • the present disclosure relates to a lens element intended to be worn in front of an eye of a person in particular to suppress, reduce progression or control abnormal refractions of the eye such as myopia or hyperopia.
  • the lens element is in particular an ophthalmic article.
  • optical article is specifically understood to mean a lens, corrective or otherwise, that can be used as spectacle glass, for spectacles for example, particularly sunglasses, goggles, visors or the like or a contact lens worn by the user in direct contact with his eye.
  • Myopia of an eye is characterized by the fact that the eye focuses distant objects in front of its retina.
  • Hyperopia of an eye is characterized by the fact that the eye focuses distant objects behind its retina.
  • Myopia is usually corrected using a concave lens and hyperopia is usually corrected using a convex lens.
  • Such focusing defect may have an impact on the progression of myopia of such individuals.
  • Foveal vision corresponds to viewing conditions for which the image of an object looked at is formed by the eye in the central zone of the retina, called the foveal zone.
  • Peripheral vision corresponds to the perception of elements of a scene that are offset laterally relative to the object looked at, the images of said elements being formed on the peripheral portion of the retina, away from the foveal zone.
  • the ophthalmic correction with which an ametropic subject is provided is usually adapted for his foveal vision.
  • the correction has to be reduced for the peripheral vision relative to the correction that is determined for the foveal vision.
  • studies carried out have shown that focusing the light far behind the peripheral retina, even with simultaneous light perfectly focused on the fovea, causes the eye to elongate and therefore causes a myopia defect to increase.
  • WO2019206569 in the name of the applicant proposes solutions by disclosing lens elements having optical elements which show in particular a focus shifting leading to a function of non-focusing an image on the peripheral retina of the eye in standard wearing conditions.
  • the present disclosure aims to provide lens elements having improved myopia or hyperopia control properties.
  • a lens element in particular for a spectacle lens, a contact lens or an intraocular lens, intended to be worn by a wearer comprising:
  • said measured surface spatial power spectral density PSD measured is for example equal or higher in a spatial frequency range between 0.3 and 10mm -1 , in particular between 0.3 and 5mm -1 than said nominal PSD nom function.
  • the measured surface spatial power spectral density PSD measured (f) may show in a logarithmic scale at least one local maximum.
  • At least one local maximum is located in spatial frequency range between 0.3-2mm -1 , limits included.
  • Said microstructured second zone may comprise at least one optical element modifying locally the optical power with respect to the refraction area having a refractive power based on a prescription for said eye of the wear.
  • Said at least one optical element modifying locally the optical power is for example chosen among a group comprising refractive or diffractive lenslet, unifocal lenslet, bifocal lenslet, multifocal lenslet, torical lenslet, Pi-Fresnel lenslet.
  • Said microstructured second zone comprises in particular several optical elements modifying locally the optical power and which are disposed according to a predefined pattern.
  • the predefined pattern may be a ring pattern in particular along several concentric rings or for example a hexagonal pattern.
  • Said at least one optical element modifying locally the optical power may be disposed on said front face or said rear face.
  • At least one optical element modifying locally the optical power is embedded in a layer of said lens element.
  • the at least one microstructured second zone may have a surface of at least 10mm 2 .
  • the least one microstructured second zone is for example located outside a central zone of the lens element.
  • the microstructured second zone can extend radially from the optical center of the lens element.
  • the present invention also concerns spectacles equipped with lens elements as defined above.
  • front or “rear” face of a layer or a lens element or surface reference is made to the propagation of the rays of light towards the eye through the ophthalmic lens when an ophthalmic device bearing the ophthalmic lens is worn on a wearer's face.
  • a "front” face is always that which is farest away to the eye of the user and therefore closest to the field of view and a “rear” face is always that which is closest to the eye of the user.
  • the disclosure relates to a lens element intended to be worn in front of an eye of a wearer.
  • lens element can refer to a lens blank, an uncut optical lens, a spectacle optical lens edged to fit a specific spectacle frame, an ophthalmic lens or a contact lens.
  • a microstructured zone is considered as a zone providing optical wavefront modification(s) in particular on its intensity, curvature, or light deviation.
  • These wavefont modifications may be achieved by different physical phenomena (interaction of light and matter) like for example refraction, diffraction, absorption (partial or total), scattering etc.
  • the microstructured zone may be located on top of a substrate, in particular on the front face but also on the rear face.
  • the microstructured zone may also be embedded in such a substrate.
  • the microstructured zone can be part of a specific optical layer.
  • a hard coat layer may protect the lens element and cover the microstructured zone and the refraction area.
  • microstructured zone can be based on absorption principle (locally up to 100%) or not.
  • microstructured zone can.also be based on scattering or light diffraction principle.
  • a lens element 10 according to the disclosure comprises:
  • the microstructured second zone 13 may present for example a plurality of optical elements 14 located for example on the front face 'F1 of lens element 10 and which may overlap partially or not.
  • the optical elements 14 may be considered as an optical microstructure having with a certain physical extension Z (deformation/height), and a physical extension X/Y (width/length /diameter).
  • microstructuring zone 13 can also be achieved in another way without distinctive optical elements 14, but with for example local refractive index variations, local absorption variations or local scatterers.
  • the lens element 10 comprises a substrate 16 and the first zone 12 with the refraction area together with the microstructured second zone 13 with the optical elements 14 form the front face F1 of the lens element 10 which is the interface with the surrounding air.
  • the microstructured second zone 13 may be embedded in a layer of a multilayer substrate, for example when the substrate comprises several layers.
  • the microstructured second zone 13 can be part of a specific optical layer of the substrate 16.
  • the substrate 16 is for example made of a plastic material, for instance a polymer substrate like a thermoset, in particular made of poly(urea-urethane), or thermoplastic plastic material, in particular made of polyamide (PA), like nylon or a polycarbonate, or polyester.
  • a plastic material for instance a polymer substrate like a thermoset, in particular made of poly(urea-urethane), or thermoplastic plastic material, in particular made of polyamide (PA), like nylon or a polycarbonate, or polyester.
  • a plastic material for instance a polymer substrate like a thermoset, in particular made of poly(urea-urethane), or thermoplastic plastic material, in particular made of polyamide (PA), like nylon or a polycarbonate, or polyester.
  • PA polyamide
  • the microstructured second zone 13 and in particular the optical elements 14 may be made of the same material as the substrate 16 and have therefore the same refractive index.
  • the microstructured zone 13 may be made with a different material having a refractive index different from the refractive material forming the substrate 16.
  • Optical elements 14 of said second zone may modify locally the optical power with respect to the first zone 12 with the refraction area having a refractive power based on a prescription for said eye of the wear.
  • At least one optical element 14 modifying locally the optical power is chosen among a group comprising refractive or diffractive lenslet, unifocal lenslet, bifocal lenslet, multifocal lenslet, torical lenslet, Pi-Fresnel lenslet.
  • the second microstructured zone 13 comprises several optical elements 14 modifying locally the optical power and disposed according to a predefined pattern, like a ring pattern in particular along several concentric rings.
  • a predefined pattern like a ring pattern in particular along several concentric rings.
  • Other pattern can be chosen like for example a hexagonal pattern.
  • the optical elements 14 are for example in figure 1 and 2 protruding from the front face F1.
  • the microstructured second zone 13 and the optical elements 14 may be located on the rear side R1 of the substrate 16.
  • the optical elements 14 may be formed by cavities (open or closed), recesses or holes.
  • the said at least one microstructured second zone 13 has a surface of at least 10mm 2 .
  • the first zone 12 with the refractive area is preferably formed as the area other than the areas formed by the at least one microstructured second zone 13.
  • the refractive area 12 is the complementary area to the areas occupied by the microstructured second zone(s) 13.
  • the microstructured second zone 13 is for example delimited by a dashed outer circle Lo and a dashed inner circle Li.
  • Figure 1 also shows two first zones 12 having annular shape for zone 12o and circular shape for the central portion 12c
  • the first zone 12 (comprising 12c and 12o) with the refraction area is configured to provide to the wearer in standard wearing conditions, in particular for foveal vision, a first optical power based on the prescription of the wearer for correcting an abnormal refraction of said eye of the wearer.
  • the object of the first zone 12 with the refraction area is to focus incoming parallel light on the retina.
  • the microstructured zone 13 aims to produce non-focalised light, for example in front of the retina and in particular in peripheral zones in order to slow down myopia.
  • the wearing conditions are to be understood as the position of the lens element 10 with relation to the eye of a wearer, for example defined by a pantoscopic angle, a Cornea to lens distance, a Pupil-cornea distance, a center of rotation of the eye (CRE) to pupil distance, a CRE to lens distance and a wrap angle.
  • a pantoscopic angle for example defined by a pantoscopic angle, a Cornea to lens distance, a Pupil-cornea distance, a center of rotation of the eye (CRE) to pupil distance, a CRE to lens distance and a wrap angle.
  • the at least one microstructured second zone 13 is located outside a central zone CR of the lens element 10.
  • the microstructured second zone 13 extends radially from the optical centre 16 of the lens element 10.
  • a lens element 10 as presented on figures 1 and 2 may be manufactured in various ways in particular by moulding and/ or machining and polishing a substrate 16 or a lens blank.
  • the power spectral density PSD represents the magnitude of unevenness of the surface or diopter for light rays on their optical path through the lens element 10. It is in particular defined in a standard ISO 10110-8:2017 entitled "Optics and photonics .- Preparation of drawings for optical elements and systems - Part 8: Surface texture”.
  • Surface texture is a characteristic relating to the profile of an optical surface that can be effectively described with statistical methods.
  • PSD In the spatial frequency range beyond 30mm -1 , PSD describes "surface roughness" which is not of interest for the present invention.
  • the spatial frequency range of interest is between 0.3 mm -1 and 10mm -1 .
  • PSD measured ( f ) is the measured PSD function.
  • Such a measurement can be carried out mechanically or optically.
  • Optical non-contact measurement is in particular preferred when the microstructured second zone 13 is embedded.
  • Such method first requires measuring the surface of the optical lens. Such surface measurements may be carried out by tactile surface measuring instrument or a non-contact instrument.
  • Some options can be used to measure a larger area such as rectangular or circular stitching.
  • the goal is to measure optical elements over at least the zone of interest.
  • the surface of the optical elements may be measured using interferometry.
  • the index of the coating layer(s) should be known to compensate for the altitude and deduce the true surface from it.
  • the second optional step of the method is to remove the shape of the first zone 12 with the refractive area of the optical lens 10.
  • the shape of the first zone 12 with the refractive area may be removed prior to any other metrological operation.
  • this second step can be considered as optional and has limited influence on the PSD function in the spatial frequency range between 0.3mm -1 and 10mm -1 .
  • This second step may be carried out using any known standard solution for analyzing profilometry and topography data.
  • the shape of the first zone 12 with the refractive area is usually a revolving shape (cylinder, sphere) corresponding to the prescription of the eye of the wearer.
  • the metrologist is to perform an adjustment or a shape removal before proceeding to the calculation of the surface condition parameters.
  • the operation consists in modeling a shape and associating it with the measured points to then subtract the shape and obtain a flat or nearly flat surface.
  • the base radius When the base radius is unknown, it may be calculated by the method of the least squares. It is a standard approach in regression analysis to approximate the solution of overdetermined systems by minimizing the sum of the squares of the residuals made in the results of every single equation. The same approach can be used with a polynomial including power higher than 3.
  • An alternative method is to define a fit surface based on a classic subset of orthogonal Zernike polynomials.
  • Measuring the microstructured second zone(s) 13 over the whole surface of the optical lens 10 may be complex with the current available measuring device.
  • the disclosure further relates to a method for measuring the whole surface of the optical lens using a currently available optical profiler.
  • the optical profiler for example an interferometry device, is able to measure the shape, waveness, roughness of the surface of the optical lens and in particular of the optical elements, by a technique which uses the interference of superimposed waves to extract information of altitude (x, y, z data).
  • Most measuring device use the x,y position of each frame to compute the final stitching because the accuracy is better than using the common data of each frame.
  • This method is also available for measuring optical elements that are encapsulated, i.e. comprised between the front and back surfaces of the optical lens, or under a coating.
  • Line 104 in figure 3 corresponds to the tangential slice along which the calculations have been carried out.
  • lens elements having such microstructured second zone 13 are quite efficient for myopia or hyperopia control.
  • the measured surface spatial power spectral density PSD measured is equal or higher in a spatial frequency range between 0.3 and 10mm -1 , in particular between 0.3 and 5mm -1 than said nominal PSD nom function.
  • the measured surface spatial power spectral density PSD measured (f) shows in a logarithmic scale at least one local maximum referenced 106.
  • the at least one local maximum 106 is located in a spatial frequency range between 0.3-2mm -1 , limits included, in particular at 0.9mm -1 .
  • a second local maximum 108 is located at 1.8mm -1 .
  • Figure 5 is a figure similar to figure 3 and showing partially a microstructured second zone 13 with optical elements 14 for another embodiment where the optical elements 14 are disposed according to a hexagonal pattern.
  • Figure 6 is similar to figure 4 and shows for the microstructured second zone 13 of figure 5 in log-log graph representation:

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  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Eyeglasses (AREA)
EP22315180.4A 2022-08-05 2022-08-05 Élément de lentille Pending EP4318094A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22315180.4A EP4318094A1 (fr) 2022-08-05 2022-08-05 Élément de lentille
PCT/EP2023/071442 WO2024028401A1 (fr) 2022-08-05 2023-08-02 Élément de lentille

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22315180.4A EP4318094A1 (fr) 2022-08-05 2022-08-05 Élément de lentille

Publications (1)

Publication Number Publication Date
EP4318094A1 true EP4318094A1 (fr) 2024-02-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP22315180.4A Pending EP4318094A1 (fr) 2022-08-05 2022-08-05 Élément de lentille

Country Status (2)

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EP (1) EP4318094A1 (fr)
WO (1) WO2024028401A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3067333A1 (fr) * 2015-03-10 2016-09-14 Schott AG Procede de fabrication d'un article en vitroceramique ou en verre avec un revetement de couleur a base de verre, article en vitroceramique ou en verre revetu et son utilisation
WO2019206569A1 (fr) 2018-04-26 2019-10-31 Essilor International Élément verre
US11226497B2 (en) * 2016-10-25 2022-01-18 Brien Holden Vision Institute Limited Devices, systems and/or methods for myopia control
WO2022074243A1 (fr) * 2020-10-09 2022-04-14 Essilor International Lentille optique à zone de diffusion continue
US20220146857A1 (en) * 2019-03-01 2022-05-12 Sightglass Vision, Inc. Ophthalmic lenses for reducing myopic progression and methods of making the same
WO2022136056A1 (fr) * 2020-12-23 2022-06-30 Essilor International Lentille optique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3067333A1 (fr) * 2015-03-10 2016-09-14 Schott AG Procede de fabrication d'un article en vitroceramique ou en verre avec un revetement de couleur a base de verre, article en vitroceramique ou en verre revetu et son utilisation
US11226497B2 (en) * 2016-10-25 2022-01-18 Brien Holden Vision Institute Limited Devices, systems and/or methods for myopia control
WO2019206569A1 (fr) 2018-04-26 2019-10-31 Essilor International Élément verre
US20220146857A1 (en) * 2019-03-01 2022-05-12 Sightglass Vision, Inc. Ophthalmic lenses for reducing myopic progression and methods of making the same
WO2022074243A1 (fr) * 2020-10-09 2022-04-14 Essilor International Lentille optique à zone de diffusion continue
WO2022136056A1 (fr) * 2020-12-23 2022-06-30 Essilor International Lentille optique

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PARKS ROBERT E ET AL: "The structure function as a metric for roughness and figure", PROCEEDINGS OF SPIE; [PROCEEDINGS OF SPIE ISSN 0277-786X VOLUME 10524], SPIE, US, vol. 9951, 27 September 2016 (2016-09-27), pages 99510J - 99510J, XP060076205, ISBN: 978-1-5106-1533-5, DOI: 10.1117/12.2238600 *
TAKACS PETER Z: "Standardization of methods for extracting statistics from surface profile measurements", PROCEEDINGS OF SPIE, IEEE, US, vol. 9173, 27 August 2014 (2014-08-27), pages 917309 - 917309, XP060039374, ISBN: 978-1-62841-730-2, DOI: 10.1117/12.2063113 *

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